// FunctionLookupTable.cs
//
// Copyright (c) 2009 Jérémie Laval and Sylvain Marchand
//
// Permission is hereby granted, free of charge, to any person obtaining a copy
// of this software and associated documentation files (the "Software"), to deal
// in the Software without restriction, including without limitation the rights
// to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
// copies of the Software, and to permit persons to whom the Software is
// furnished to do so, subject to the following conditions:
//
// The above copyright notice and this permission notice shall be included in
// all copies or substantial portions of the Software.
//
// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
// IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
// FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
// AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
// LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
// OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
// THE SOFTWARE.
//
//

using System;
using System.Reflection;
using System.Collections.Generic;

namespace Bechamel
{
	public static class FunctionLookupTable
	{
		static Dictionary<string, MethodInfo> lookupTable;
		
		static FunctionLookupTable()
		{
			lookupTable = new Dictionary<string, MethodInfo>();
			
			lookupTable.Add("display", StdLib.GetByName("Display"));
			lookupTable.Add("print", typeof(Console).GetMethod("WriteLine", new Type[] { typeof(object) }));
			lookupTable.Add("newline", typeof(Console).GetMethod("WriteLine", Type.EmptyTypes));
			lookupTable.Add("exit", StdLib.GetByName("Exit"));
			lookupTable.Add("call", StdLib.GetByName("Call"));

			lookupTable.Add("reverse", StdLib.GetByName("Reverse"));
			lookupTable.Add("car", StdLib.GetByName("Car"));
			lookupTable.Add("cdr", StdLib.GetByName("Cdr"));
			lookupTable.Add("cons", StdLib.GetByName("Cons"));
			lookupTable.Add("set-car!", StdLib.GetByName("SetCar"));
			lookupTable.Add("set-cdr!", StdLib.GetByName("SetCdr"));
			
			lookupTable.Add("pair?", StdLib.GetByName("IsPair"));
			lookupTable.Add("number?", StdLib.GetByName("IsNumber"));
			lookupTable.Add("string?", StdLib.GetByName("IsString"));
			lookupTable.Add("null?", StdLib.GetByName("IsNull"));
			lookupTable.Add("list?", StdLib.GetByName("IsList"));
			lookupTable.Add("string-append", StdLib.GetByName("StringAppend"));
		}

		public static void RegisterStandardFunction(string name, MethodInfo info)
		{
			lookupTable.Add(name, info);
		}

		public static MethodInfo GetMethodInfo(IdentifierNode id)
		{
			// Get the name of the function
			string name = id.Name;
			
			// Check if that correspond to a fundamental function
			MethodInfo m;
			lookupTable.TryGetValue(name, out m);
			
			return m;
		}
	}
}
